octeontx2-pf: Fix pfc_alloc_status array overflow

This patch addresses pfc_alloc_status array overflow occurring for
send queue index value greater than PFC priority. Queue index can be
greater than supported PFC priority for multiple scenarios (e.g. QoS,
during non zero SMQ allocation for a PF/VF).
In those scenarios the API should return default tx scheduler '0'.
This is causing mbox errors as otx2_get_smq_idx returing invalid smq value.

Fixes: 99c969a83d82 ("octeontx2-pf: Add egress PFC support")
Signed-off-by: Suman Ghosh <sumang@marvell.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
index 282db6fe3b08a91d85fc5a0ef23165e05b16af6c..67aa02bb2b85ca0967422c3e98a765c4e4bd67dd 100644 (file)
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -884,7 +884,7 @@ static inline void otx2_dma_unmap_page(struct otx2_nic *pfvf,
 static inline u16 otx2_get_smq_idx(struct otx2_nic *pfvf, u16 qidx)
 {
 #ifdef CONFIG_DCB
-       if (pfvf->pfc_alloc_status[qidx])
+       if (qidx < NIX_PF_PFC_PRIO_MAX && pfvf->pfc_alloc_status[qidx])
                return pfvf->pfc_schq_list[NIX_TXSCH_LVL_SMQ][qidx];
 #endif